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Volume 11, Number 6, 2006

Monte Carlo study of electron dose distributions produced by the elekta precise linear accelerator

Hassan Ali Nedaie, M. A. Mosleh-Shirazi, M. Shariary, H. Gharaati, M. Allahverdi


Background Monte Carlo simulation of radiation transport is considered to be one of the most accurate methods of radiation therapy dose calculation and has ability to reduce the uncertainty in the calculated dose to a few percent.
Aims (1) To study the efficacy of the MCNP4C Monte Carlo code to simulate the dose distribution in a homogeneous medium produced by electron beams from the Elekta Precise linear accelerator. (2) To quantify the effect of introduction of various components to the simulated geometry for the above machine.
Materials/Methods Full Monte Carlo simulation of the detailed geometry of the Precise treatment head for 8 and 15MeV energies and 10×10 applicator was performed. Experimental depth dose and lateral profi les at 2cm depth were measured using a P-type diode detector with a 2.5mm diameter. To quantify the effects of different parts of the treatment head, seven cases were simulated for a 15MeV beam to refl ect increasing levels of complexity, by step-wise introduction of beam divergence, primary and secondary scattering foils, secondary collimators, applicator, Mirror and Mylar screen.
Results The discrepancy between measured and calculated data is within 2%/2mm at both 8 and 15MeV. In terms of the mean and most probable energies at the surface, the difference was <0.2MeV for the majority of cases and the maximum deviation was no more than 0.3MeV.
Conclusions The results obtained with MCNP4C agree well with measured electron dose distributions. Inclusion of all the main components of the treatment head in the simulated geometry is necessary to avoid discrepancies of about 5% compared to measurements.

Signature: Rep Pract Oncol Radiother, 2006; 11(6) : 287-292


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